I have had ducks for a while now and have never wormed them, but a couple of my ducks have started coughing, and seem short of breath! I really need some advice on a wormer. I have Avitrol plus it does Threadworm, Caecalworm, roundworm, gapeworm, gizzardworm and tapeworm. Are there any others that I should also be worming for? Can you directly administer wormer to each individual bird? And if you just give a solution how do you know if they are getting to much or too little? It seems to be ornamental cage bird specific (not mentioning poultry on it) but the front just reads bird wormer syrup concentrate, would this be OK? Any help would be great.